*{margin: 0;padding: 0;}
ul,ol{list-style: none;}
a{text-decoration: none;}
img{display: block;}
html{font-size: 62.5%;}
body{font-family: 'Helvetica','microsoft yahei', sans-serif;font-weight: 500;}
@media screen and (max-width: 1279px) {
  html {
      font-size: 54.6875%;
  }
}
